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Secure nginx with Let's Encrypt on Ubuntu 18.04

Browsing linux filesystem

Browsing The Filesystem

Some Important Directories
Red hat root (main)directory: /
Home Directories:                /root                       ( home directory of root only )
                                            /home/username      ( for all users )
User Excecution :                /bin, /usr/bin, /usr/local/bin
system Excecution :             /sbin, /user/sbin, /usr/local/sbin
Other Mountpoints :             /media, /mnt
Configuration :                     /etc
Temporary files :                  /tmp
Kernels and Bootloader      /boot
Server Data :                      /var, /sys
System Information :           /proc, /sys
Shared Libraries :               /lib, /usr/lib, /usr/local/lib

=> pwd                                 to see current working directory
Note :   1) Names may be up to 255 characters
                2) All characters are valid, except the forward-slash
                3) Names are case-sensitive

=> mkdir dirname             to make a dir

=> mkdir 1 2 3 4              to make multipal dir

=> mv o-name n-name      to rename dir

=> touch filename             to make a empty file

=> touch {a,s,d,f}.{jpg,doc,mp3}

=> mv o-name n-name     to rename file

=> vi filename                   to see or edit the file

=> cat filename                 to see the contant of file
(cat > , cat >>)

=> nano filename              to edit in text file
=> cd dirname                  to change dir
=> cd ..                            to a directory one level up
=> cd                               to goto home directory
=> cd -                             to your previous directory
=> ls -a                             to list of file and dir with hidden file 
=> ls -l                              to see long listing of file and dir (ll)

=> cp sourcefile destination             ( cp file1 /home/macho )
                to copy file

=> cp -r sourcedir destination          ( cp -r dir1 /home/macho )
                to copy dir recursively   

=> cp -r -v sourcedir destination     ( cp -r -v dir1 /home/macho )
                to copy dir & show process         

=> mv sourcefile destination            ( mv file1 /home/macho )
                to move file into elesewhere

=> mv dirname destination               ( mv dir1 /home/macho )

=> rm filename                                 (to remove any file)

=> rm -rf *.mp3                               (to remove all file which extension .mp3)

=> rmdir directoryname                    ( to remove dir )

=> Backing-up your system configuration
       -mkdir /root/backups-20100415
      -cp -r -v /etc/sysconfig /root/backup-20100415

Vishal Vyas
Linux guru.


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